12/11/2009

1

Low-Impact Development(LID)

CE4505 Surface Water Quality E i iEngineering

Stormwater Mgmt: Problems

• Flooding;• Erosion;• Water quality issues;• Flashiness of urban river systems;• Water scarcity;

12/11/2009

2

12/11/2009

3

12/11/2009

4

Low Impact Development

12/11/2009

5

• integrate stormwater management early in site planning

Components of LID

g g y p gactivities • use natural hydrologic functions as the integrating framework • focus on prevention rather than mitigation • emphasize simple, nonstructural, low-tech, and low cost methods • manage as close to the source as possible • distribute small-scale practices throughout the landscape • rely on natural features and processes • create a multifunctional landscape

Ten Common LID Practices

1 Rain Gardens and Bioretention Cells1. Rain Gardens and Bioretention Cells2. Rooftop Gardens 3. Sidewalk Storage 4. Vegetated Swales, Buffers, and Strips; Tree Preservation 5. Roof Leader Disconnection 6. Rain Barrels and Cisterns 7. Permeable Pavers 8. Soil Amendments 9. Impervious Surface Reduction and Disconnection p10.Pollution Prevention and Good Housekeeping

12/11/2009

6

Rain gardens

More rain gardens

12/11/2009

7

Bioretention Cells

12/11/2009

8

Swales

Green Roofs

12/11/2009

9

Green Roofs

Courses

CE 4640 Stormwater Management and Low ImpactCE 4640 - Stormwater Management and Low Impact Development Design techniques for stormwatercollection, conveyance, infiltration, and detention storage systems are discussed, both traditional stormwater management systems and newer approaches based on the philosophy of low impact development (LID) that seek not to alter the natural ecology of a site.

Credits: 3.0 Lec-Rec-Lab: (3-0-0) Semesters Offered: Spring Pre-Requisite(s): CE 3620